Quarter	Hours
1977-01-01	171
1977-04-01	171
1977-07-01	171
1977-10-01	171
1978-01-01	169
1978-04-01	169
1978-07-01	169
1978-10-01	169
1979-01-01	168
1979-04-01	168
1979-07-01	168
1979-10-01	168
1980-01-01	166
1980-04-01	166
1980-07-01	166
1980-10-01	166
1981-01-01	160
1981-04-01	156
1981-07-01	157
1981-10-01	161
1982-01-01	157
1982-04-01	154
1982-07-01	155
1982-10-01	155
1983-01-01	155
1983-04-01	154
1983-07-01	155
1983-10-01	154
1984-01-01	155
1984-04-01	149
1984-07-01	150
1984-10-01	150
1985-01-01	152
1985-04-01	148
1985-07-01	149
1985-10-01	152
1986-01-01	148
1986-04-01	152
1986-07-01	153
1986-10-01	152
1987-01-01	149
1987-04-01	148
1987-07-01	149
1987-10-01	151
1988-01-01	151
1988-04-01	151
1988-07-01	152
1988-10-01	147
1989-01-01	147.20
1989-04-01	147.10
1989-07-01	147.60
1989-10-01	147.10
1990-01-01	146.70
1990-04-01	146.70
1990-07-01	147.30
1990-10-01	147
1991-01-01	146
1991-04-01	146.10
1991-07-01	146.70
1991-10-01	145.70
1992-01-01	145.30
1992-04-01	146
1992-07-01	146.30
1992-10-01	146
1993-01-01	145.20
1993-04-01	144.40
1993-07-01	145.60
1993-10-01	145.30
1994-01-01	145.10
1994-04-01	145.30
1994-07-01	146.20
1994-10-01	146.10
1995-01-01	145.70
1995-04-01	145.30
1995-07-01	145.70
1995-10-01	144.80
1996-01-01	144.20
1996-04-01	143.89
1996-07-01	144.60
1996-10-01	144.20
1997-01-01	143.70
1997-04-01	143.10
1997-07-01	143.60
1997-10-01	143.10
1998-01-01	142.74
1998-04-01	142.14
1998-07-01	143.15
1998-10-01	142.51
1999-01-01	142.05
1999-04-01	141.72
1999-07-01	142.85
1999-10-01	142.40
2000-01-01	148.60
2000-04-01	143.20
2000-07-01	129.40
2000-10-01	140.50
2001-01-01	148.70
2001-04-01	142.80
2001-07-01	129.10
2001-10-01	139.40
2002-01-01	142.90
2002-04-01	146
2002-07-01	129.30
2002-10-01	140
2003-01-01	145
2003-04-01	140.90
2003-07-01	129.20
2003-10-01	140.50
2004-01-01	143.70
2004-04-01	141.60
2004-07-01	129.40
2004-10-01	136.30
2005-01-01	139.20
2005-04-01	144.30
2005-07-01	128.30
2005-10-01	135.80
2006-01-01	143.40
2006-04-01	138.80
2006-07-01	127.90
2006-10-01	134
2007-01-01	143.10
2007-04-01	138.40
2007-07-01	126.80
2007-10-01	133.60
2008-01-01	137.50
2008-04-01	142.20
2008-07-01	125.20
2008-10-01	136
2009-01-01	138.20
2009-04-01	134.90
2009-07-01	124.30
2009-10-01	132.70
2010-01-01	136.80
2010-04-01	135.30
2010-07-01	125.60
2010-10-01	130.90
2011-01-01	137.90
2011-04-01	134.50
2011-07-01	121.60
2011-10-01	129.80
2012-01-01	137.50
2012-04-01	133.10
2012-07-01	121.60
2012-10-01	128.60
2013-01-01	132.80
2013-04-01	136
2013-07-01	121.20
2013-10-01	128.90
2014-01-01	134.90
2014-04-01	131.20
2014-07-01	120.80
2014-10-01	129.70
2015-01-01	134.00
2015-04-01	131.50
2015-07-01	121.70
2015-10-01	129.30
2016-01-01	129.70
2016-04-01	136.70
2016-07-01	121.10
2016-10-01	127.50
2017-01-01	135.50
2017-04-01	131.40
2017-07-01	122.00
2017-10-01	126.80
2018-01-01	131.40
2018-04-01	134.90